Oh, she can see him all right.

"Hireki!" she snaps, and slashes her hand through the air to dissipate his veil. "Knock it off," she says to the Gentleman. "Drop the enchantments or I will drop you." She doesn't know this faerie, but she can smell fae magic all over him. He's not subject to Winter, so he doesn't have to listen to her, but she is the goddamn Winter Lady, and if he decides not to, she will make him.